Nothing should be expressed in two words that can as well be expressed in one; i.e. no synonymes should be used or very rarely, but the whole be as short as possible, consistent with clearness.
The words should be so placed as to be agreeable to the ear in reading.
Summarily,—It should be smooth,
clear, and
short,
For the contrary qualities are displeasing.
But taking the query otherwise:
An ill man may write an ill thing well; that is, having an ill design he may use the properest style and arguments (considering who are to be readers) to attain his ends.
In this sense, that is best wrote which is best adapted for attaining the end of the writer.
Can a man arrive at perfection in this life, as some believe; or is it impossible, as others believe?
Perhaps they differ in the meaning of the word perfection.